Rollup merge of #75223 - Aaron1011:feature/session-track-caller, r=eddyb
Rollup merge of #75223 - Aaron1011:feature/session-track-caller, r=eddyb

Add #[track_caller] to `Session::delay_span_bug`

This forwards the caller span to `Handler::delay_span_bug`

aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust